A search for dead quasars among nearby luminous galaxies. I - The stellar kinematics in the nuclei of NGC 2613, NGC 4699, NGC 5746, and NGC 7331

Details A search for dead quasars among nearby luminous galaxies. I - The stellar kinematics in the nuclei of NGC 2613, NGC 4699, NGC 5746, and NGC 7331 A search for dead quasars among nearby luminous galaxies. I - The stellar kinematics in the nuclei of NGC 2613, NGC 4699, NGC 5746, and NGC 7331

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...402...76b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 402, no. 1, p. 76-94.

Astronomy and Astrophysics

Astronomy

25

Angular Velocity, Galactic Nuclei, Quasars, Spiral Galaxies, Stellar Motions, Active Galactic Nuclei, Black Holes (Astronomy), Galactic Rotation

Scientific paper

Observations and analysis are presented of four spiral galaxies with M(B) = -20 or less: NGC 2613, NGC 4699, NGC 5746, and NGC 7331. Optical long-slit spectra of the galaxies are used to obtain the stellar kinematics as a function of radius, and the surface brightness profiles are obtained from broadband images or the calibrated intensity profile along the spectrograph slit. Dynamical models of each galaxy are constructed using a constrained maximum entropy technique to investigate if the observed stellar kinematics require the presence of a central unseen mass. For all four galaxies it is found that the models without central black holes and with constant M/L as a function of radius fit the observational data. None of these galaxies shows compelling evidence of harboring a black hole of about a billion solar masses. Dynamical models that include a central black hole with this mass fit the observations of NGC 2613, NGC 4699, and NGC 5746, but not NGC 7331.

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